External Torx, Internal Torx, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
9/16 ", 13/16 ", 5 mm, 5/16 ", 23 mm
1/2, 1/4, 1-1/2, 3/4, 2-1/2
19.05, 38.1, 9.53, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide